OK nerdlings, lissen up!

Ogre is based on a series of stories called "Bolo" by Keith Laumer. Not all Bolos were ogre sized vehicles, only the really big ones. The more common ones were AI controlled tanks (regular sized - for tanks). Note that the bigger bolos surived being nuked.

Ogres are more like the Supreheavies in 40k. Enough big guns shooting at them will take them out.

The slammers panzers (or blowers) are still only regular size tanks.